A Time Comes When It Is Not Like Before
The short answer
You eat the same amount, but your belly is getting bigger; eat even a little late and your hands shake; an hour after a meal you are too sleepy to function — has your habit gotten worse? What has changed is not the habit, but the margin the body allows for it. As muscle grows less responsive to insulin with age, what you eat starts taking a different path through the body. If your weight has dropped on its own, or thirst persists, testing comes first.
Contents
I often hear that eating the same things does not feel the same as it used to.
"I eat the same amount, but my belly is getting bigger." "If I eat even a little late, my hands start shaking." "About an hour after a meal I get so sleepy I cannot stand it."
Yet the checkup says nothing yet. Blood sugar and cholesterol sit right around borderline, or within the normal range.
The habit has not changed. The body has.
The Body Absorbs Ordinary Strain
In your twenties, you could stay up all night and still be fine the next day. Eating a little late, eating a little too much, sleeping a little too little — it made no difference. There was the strength of a young body, and there was also, alongside it, the margin that let the body absorb that much.
As long as the strain stays inside that margin, nothing changes on the surface. That is why you can live that way for thirty years without anything happening.
The problem is when that margin shrinks.
What Shrinks the Margin
It is not one thing. As you age, several things change in the body at once.
Muscle mass declines, activity level drops, low-grade inflammation increases, and the number and density of small blood vessels also decreases. In bone, the breaking-down side gradually starts to outpace the building-up side.
None of these alone is the culprit. Each has been confirmed separately, and there is no single study that measures them all together. But when several layers tilt a little in the same direction, the range the body can absorb narrows — this is the picture I have seen in the clinic.
Where Does a Meal Go
There is one more piece here.
When you eat, a large share of that carbohydrate is stored in muscle. Muscle takes it in and holds it until it is needed.
But as you age, muscle becomes less responsive to insulin (insulin resistance).
Even eating the same thing, the path it takes inside the body changes. So triglycerides rise and fat accumulates in the liver. This happens even without eating more.
A More Accurate Way to Put It Than "The Storeroom Got Smaller"
A shrinking margin is often described as the storeroom getting smaller. That is not wrong.
But closer to what actually happens is this: the storeroom door no longer opens as wide as it used to, so what comes in flows somewhere else instead.
And that somewhere else happens to be fat in the liver.
So I Do Not Leave It at "Just Age"
This is not to say that everyone ends up this way with age, so nothing can be done.
Even at the same age, people differ. And there is one piece of data worth noting. When young people whose muscle did not respond well to insulin were made to exercise once, the amount of fat the liver produced after that day's meal decreased.
The path of what comes in can also change.
The scope of this trial is narrow. It measured the change on that single day after one bout of exercise, and there is not yet data showing that a tilt built up over years of aging can be reversed. So what to take from this is a single direction, nothing more.
And What Was Already Weak Shows Up First
One more thing to add.
When the margin shrinks, it is not that everywhere gets worse evenly — what was already weak shows up first.
Someone whose digestion was already weak shows it there first. Someone whose sleep was already light shows it in sleep first. That is also why losing just a little weight can bring discomfort in an unexpected place. A shrunken margin touches the softest spot first.
Sometimes it is not a new disease — it is a strain that was already there, only now revealed.
That said, a symptom that is genuinely new is not something to wave off this way. A symptom you have never seen before needs to be checked first.
When Testing Comes First
If your weight has dropped unexpectedly, if thirst does not go away no matter how much you drink, or if fatigue has continued for months, this discussion does not come first for you. There is something else that needs to be checked first.
If you put not being like before down to age alone, there is nothing left to work with.
But what has actually changed is the range the body can absorb, and that range is shaped jointly by muscle, activity, and the timing of meals. Among these, there is something you can act on now.
Even if checkup numbers are still normal, if something feels different from before, that may be the signal that moved first. The numbers follow later. This continues into a discussion of how the body does not tilt all at once.
Written by Dr. Heo Ji-young (PhD in Korean Medicine Pathology, Kyung Hee University · former Research Professor of Herbology, Kyung Hee University)
IF YOU NEED CARE
Have a symptom that's been on your mind?
Choose a time on Naver, or send your concerns before your first visit.